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fault_injection.go 3.54 KB
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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package kv
import (
"sync"
"golang.org/x/net/context"
)
// InjectionConfig is used for fault injections for KV components.
type InjectionConfig struct {
sync.RWMutex
getError error // kv.Get() always return this error.
commitError error // Transaction.Commit() always return this error.
}
// SetGetError injects an error for all kv.Get() methods.
func (c *InjectionConfig) SetGetError(err error) {
c.Lock()
defer c.Unlock()
c.getError = err
}
// SetCommitError injects an error for all Transaction.Commit() methods.
func (c *InjectionConfig) SetCommitError(err error) {
c.Lock()
defer c.Unlock()
c.commitError = err
}
// InjectedStore wraps a Storage with injections.
type InjectedStore struct {
Storage
cfg *InjectionConfig
}
// NewInjectedStore creates a InjectedStore with config.
func NewInjectedStore(store Storage, cfg *InjectionConfig) Storage {
return &InjectedStore{
Storage: store,
cfg: cfg,
}
}
// Begin creates an injected Transaction.
func (s *InjectedStore) Begin() (Transaction, error) {
txn, err := s.Storage.Begin()
return &InjectedTransaction{
Transaction: txn,
cfg: s.cfg,
}, err
}
// BeginWithStartTS creates an injected Transaction with startTS.
func (s *InjectedStore) BeginWithStartTS(startTS uint64) (Transaction, error) {
txn, err := s.Storage.BeginWithStartTS(startTS)
return &InjectedTransaction{
Transaction: txn,
cfg: s.cfg,
}, err
}
// GetSnapshot creates an injected Snapshot.
func (s *InjectedStore) GetSnapshot(ver Version) (Snapshot, error) {
snapshot, err := s.Storage.GetSnapshot(ver)
return &InjectedSnapshot{
Snapshot: snapshot,
cfg: s.cfg,
}, err
}
// InjectedTransaction wraps a Transaction with injections.
type InjectedTransaction struct {
Transaction
cfg *InjectionConfig
}
// Get returns an error if cfg.getError is set.
func (t *InjectedTransaction) Get(k Key) ([]byte, error) {
t.cfg.RLock()
defer t.cfg.RUnlock()
if t.cfg.getError != nil {
return nil, t.cfg.getError
}
return t.Transaction.Get(k)
}
// Commit returns an error if cfg.commitError is set.
func (t *InjectedTransaction) Commit(ctx context.Context) error {
t.cfg.RLock()
defer t.cfg.RUnlock()
if t.cfg.commitError != nil {
return t.cfg.commitError
}
return t.Transaction.Commit(ctx)
}
// GetSnapshot implements Transaction GetSnapshot method.
func (t *InjectedTransaction) GetSnapshot() Snapshot {
return &InjectedSnapshot{
Snapshot: t.Transaction.GetSnapshot(),
cfg: t.cfg,
}
}
// InjectedSnapshot wraps a Snapshot with injections.
type InjectedSnapshot struct {
Snapshot
cfg *InjectionConfig
}
// Get returns an error if cfg.getError is set.
func (t *InjectedSnapshot) Get(k Key) ([]byte, error) {
t.cfg.RLock()
defer t.cfg.RUnlock()
if t.cfg.getError != nil {
return nil, t.cfg.getError
}
return t.Snapshot.Get(k)
}
// BatchGet returns an error if cfg.getError is set.
func (t *InjectedSnapshot) BatchGet(keys []Key) (map[string][]byte, error) {
t.cfg.RLock()
defer t.cfg.RUnlock()
if t.cfg.getError != nil {
return nil, t.cfg.getError
}
return t.Snapshot.BatchGet(keys)
}
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